They called him A23a and for almost forty years he was the undisputed sovereign of the ice, the largest iceberg in the world. A giant of almost a billion tons adrivate in the ocean. Today, that giant is experiencing his last few weeks, shattering in a spectacular way while traveling towards his end. A sunset that, observed by scientists, becomes a precious opportunity to understand the delicate balances of our planet.
The long history of A23A
His story begins back in 1986, when he detached himself from the Filchner-Rronne ice platform in Antarctica. For over 30 years, however, he has remained deceived on the seabed of the Weddell sea, almost like a dormant giant. Only in 2020 he resumed his journey, dragged by the ocean currents to the north, along a broken route known as the “Vicolo degli Iceberg”. A path without return that leads the large masses of ice to merge into milder waters.
The numbers of a shattered giant
At the height of its size, A23a measured almost 3,700 square kilometers, a larger surface in the Aosta Valley. Today, according to the latest analyzes of the satellite images, around half of the 1,700 square kilometers has reduced to less than half. “Iceberg is rapidly breaking and is releasing very large pieces,” he explained to the CNN Andrew Meijers, the British Antarctic Survey (Bas) oceanographer, the institute that has followed the movements closely.
In recent weeks, the disintegration process has undergone a dramatic acceleration. Exposed to higher and lashed water temperatures by the waves of the southern Atlantic, the Megaberg started to give in, losing huge fragments, some large up to 400 square kilometers. A phenomenon that experts expected, but whose rapidity still surprised. “It is practically decomposing from the bottom. The water is too hot because it can remain,” Meijers underlined.
The danger escaped by penguins and seals
A23a’s journey was not suspended. In March of this year, a remote British territory that hosts very important colonies of penguins and seals were stranded for a short period of the island of Georgia. It has been feared that the ice giant could block animal foraging routes, with potentially devastating consequences for their children. Fortunately, at the end of May, the iceberg freed himself and resumed his drift.
Not just an iceberg: a powerful signal for the planet
Now his race has almost come to an end. According to scientists, within a few weeks A23a will cease to exist as a unique entity, shattering into too small pieces to be monitored. Its merger will release a huge amount of fresh and cold water in the ocean, an event that, according to the researchers of the Bas, “it is likely that it has had a significant impact on the organisms present on the seabed and in the surrounding waters”.
Iceberg’s detachment is a natural process, but the context in which it takes place is no longer. Scientists point out that Antarctic glacial platforms have lost billions of tons of ice in recent decades, at a growing rhythm. This phenomenon is largely due to the heating of ocean waters and changes in currents, processes related to climate change of anthropic origin. The end of A23a, therefore, is not only the chronicle of the disappearance of a natural giant. It is a powerful reminder of the fragility of polar ecosystems and a visible symbol of a world that is changing at a speed that we can no longer allow us to ignore.
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